Table 1.
Properties of the lines detected towards the molecular arc in CrA.
| Transitions | ν(a) | Eup (a) | log10(Aul) (a) | gu (a) | δVchan (a) | ncr (c) | ∫I [K km s−1] (a) | ||
|---|---|---|---|---|---|---|---|---|---|
| (MHz) | (K) | (s−1) | (km s−1) | (104 cm−3) | “A” | “B” | “C” | ||
| CH3OH-A (80, 8-71, 7) | 95 169.391 | 84 | −5.37 | 68 | 1.54 | 1.3–1.4 | 8.6 | 4.1 | 6.1 |
| CH3OH-A (21, 2-11, 1) | 95 914.310 | 22 | −5.60 | 20 | 1.54 | 2.0–2.1 | 4.1 | 1.8 | 3.9 |
| CH3OH-A (31, 3-40, 4) | 107 013.831 | 28 | −5.51 | 28 | 0.17 | 3.2–3.5 | 4.5 | < 2.6 | 2.8 |
| SiO (5-4) | 217 104.980 | 31 | −3.28 | 11 | 0.51 | 153.1–156.1 | 1.2 | 3.7 | < 0.6 |
| CH3OH-E (42, 3-31, 2) | 218 440.063 | 46 | −4.33 | 36 | 0.17 | 24.3–23.4 | 19.2 | 8.6 | 9.2 |
| p-H2CO (30, 3-20, 2) | 218 222.192 | 21 | −3.55 | 7 | 0.17 | 160.1–183.0 | 14.3 | 8.9 | 17.9 |
| CH3OH-A (51, 4-41, 3) | 243 915.788 | 50 | −4.22 | 44 | 0.15 | 19.9–21.1 | – | 6.9 | 3.9 |
Notes. (a)Spectroscopic data from The Cologne Database for Molecular Spectroscopy (Müller et al. 2005). (b)The SiO (5-4) spectrum is smoothed in velocity by a factor of three to increase sensitivity. (c)Critical densities obtained considering downward collision rates in a multilevel system and a temperature range of 50–100 K (Sect. 3.3). Collisional rates taken from the LAMDA database (Schöier et al. 2005), based on Balança et al. (2018) for SiO, Wiesenfeld & Faure (2013) for p-H2CO and Rabli & Flower (2010) for the A- and E-type CH3OH. (d)We assume an uncertainty of 20%. Regions “A”, “B”, and “C” are centred at the peak positions of CH3OH (42, 3–31, 2), SiO (5–4), and p-H2CO (30, 3–20, 2), respectively (see Fig. 2).
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